RV5C387A_03 datasheet(48/49 Pages) RICOH

Part #	RV5C387A

Description	I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

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Manufacturer	RICOH [RICOH electronics devices division]

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RV5C387A

48

8.3-3 Applied Process of Reading Time and Calendar Data Synchronized with Periodic Interrupt

Time data need not be read from all the time counters when used for such ordinary purposes as time count

indication. This applied process can be used to read time and calendar data with substantial reductions in the load

involved in such reading.

CTFG=1?

Generate Interrupt to CPU

Write “

×,×,×,×,0,1,0,0”

to Control Register 1

Write “

×,1,×,1,×,0,1,1”

to Control Register 2

NO

YES

NO

YES

Write “

×,1,×,1,×,0,1,1”

to Control Register 2

Use Previous Minute,

Hour, Day-of-week,

and Day-of-month Data

Other Interrupt

Processes

Read Minute, Hour, Day-of-week,

and Day-of-month Counters

*

1

*

2

*

4

*

3

Second Digit = 00?

For Time Indication in “Day-of-month, Day-of-week, Hour,

Minute, and Second” Format:

*1) This step is intended to select the level mode as a waveform mode for the periodic interrupt function.

*2) This step must be completed within 0.5sec.

*3) This step is intended to read time data from all the time counters only in the first session of reading time data after writing time data.

*4) This step is intended to set the CTFG bit to 0 in the control register 2 to cancel an interrupt to the CPU.

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RV5C387A Datasheet(PDF) 48 Page - RICOH electronics devices division

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